CaribSea Rubble Zone boasts many beneficial uses thanks to its very porous aragonitic calcium carbonate structure. Perfect as a natural biological filter media and buffering agent, CaribSea Rubble Zone is ideal for supporting efficient biological filtration or proper pH in marine aquariums, brackish water setups, African cichlid tanks as well as ponds. Naturally pleasing shapes make it great for rockwork for aquarium landscaping or for anchoring coral frags. Natural assorted pieces. Average size of each rock varies between approximately 1-1/2 to 4 inches.

Please Note: CaribSea Rubble Zone is sold by volume. Quantity and size of rubble will vary.

As a Display: Place as desired on bottom of aquarium, one or two large pieces of live rock surrounded by Rubble Zone makes an impressive display.

Refugium Use: Place along the bottom of the refugium or in a pile. It makes an excellent substrate for macroalgae holdfasts and a superb growing area for copepods and other benthic food sources.

Cryptic Zone: In a crowded refugium, you may use in its container! Simply remove the label and drill several 1/4" to 1/2" holes in the container itself. Refill with Rubble Zone and place in an area of good flow within your sump!

For Entertaining Burrowing Fish and Inverts: Place into an empty aquarium and then add fine sand to fill in the void space for a total depth of 3-4 inches. You can use the entire aquarium bottom, or just a section.

As a Sub-Structure: Use to stabilize rock formations.

For Coral Propagation: Use Rubble Zone to anchor new coral frags.

CaribSea Rubble Zone tips for use in FreshwaterRinse well before use.
Note: CaribSea Rubble Zone contains aragonitic calcium carbonate rubble and will raise pH in freshwater. Do not use is soft water aquaria.

African Cichlid Tanks: Place as desired on bottom of aquarium to provide cover for smaller fish or to help prevent larger fish from disturbing finer substrates. May also be used in the aquarium filter for biological and pH support. Rubble Zone can also be placed in a pile in a corner for the aquarium for interesting hiding places and secure nesting areas.

Pond Use: Place Rubble Zone in pond filter for both biological support and support of pond pH.

Brackish Water Tanks: Place Rubble Zone as desired in aquarium. May also be used in the aquarium filter for biological and pH support.

Determining how much substrate to buy for your new aquarium depends on the size and shape of your tank, as well as the depth of the substrate bed you wish to achieve. Another factor is the type of aquascaping structure you're planning.

Refugiums, small aquariums that either sit next to or hang onto an existing saltwater or reef aquarium, are used by a growing number of aquarists to continually cycle water into and out of the existing tank.

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CaribSea Rubble Zone 1 Gallon
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Very nice and handy.
I say " nice and handy" because it is coral pieces that are basically uniform in size with none to very little dust, And handy to use, without being super large pieces. I used them to natieally raise the Ph in my Goldfish tank. And it did that very well without clouding the water with coral dust. Pieces are about 2" long and vary in width to a max of 1". My Loaches love them as I have no gravel in there for them to hide. Overall a great product and recommended.
February 22, 2015

Great small/medium decorative/functional rock
I first got a container for filling in some extra refugium space and have since bought additional ones for new tanks being set up. Almost all pieces are one to four inches and some are very decerative, but very little waste rubble. With time great for anchoring macros or creating living rock. The only minor drawback if you can even call it that is that it is completely dry shipped as opposed to some live rock options. Which means you should let it cycle and cure, then you need to seed it with copepods and beneficial bacteria or whatever you want as it isnt teaming with life before you get it. Overall I think it is very decorative or functional if you want small to medium rock pieces.
January 21, 2015

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